Date: Thu, 27 Sep 2007 23:18:01 -0500 From: Eric Schuele <e.schuele@computer.org> To: freebsd-current@freebsd.org Subject: Trouble with GDB and specific app on 7.0-CURRENT.... Message-ID: <46FC8079.6030304@computer.org>
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Hello,
I have a particular app that I am unable to debug using gdb. When I
attach to the app and continue it, gdb begins to take up 100% of my cpu.
It will do this forever (well longer than I've ever waited).
I am able to debug this particular app on my 6.2-STABLE machine. And I
can debug other apps on my 7.0 machine. I've tried both gdb 6.1 and gdb
6.6 on my 7.0 machine with no change in behavior.
I first thought maybe I had done something odd when rebuilding my
kernel/world? But I've built a second 7.0 machine and stuck with the
GENERIC kernel and I have the same results.
Most times I can not break into the app once I have continued it. I
have attached gdb to gdb to watch what it is doing and it appears to
give me a few different backtraces, though it is always one of maybe
three traces. [See below for bt of gdb attached to gdb, unfortunately
its not the same bt I was seeing... but may offer some insight?]
Has anyone seen behavior like this? What else can I provide that might
help diagnose this?
--
Regards,
Eric
Backtrace of gdb ==> gdb
#0 0x2874cbbb in ptrace () from /lib/libc.so.7
#1 0x08068b42 in i386fbsd_resume (ptid={pid = -1, lwp = 0, tid = 0},
step=0,
signal=TARGET_SIGNAL_CHLD) at i386fbsd-nat.c:76
#2 0x080ed0de in resume (step=0, sig=TARGET_SIGNAL_CHLD) at infrun.c:626
#3 0x080f05ed in keep_going (ecs=0xbfbfe544) at infrun.c:2892
#4 0x080ef284 in handle_inferior_event (ecs=0xbfbfe544) at infrun.c:2021
#5 0x080ed63e in wait_for_inferior () at infrun.c:1009
#6 0x080ed46a in proceed (addr=4294967295, siggnal=TARGET_SIGNAL_DEFAULT,
step=0) at infrun.c:827
#7 0x080ea249 in continue_command (proc_count_exp=0x0, from_tty=1)
at infcmd.c:642
#8 0x0808082b in do_cfunc (c=0x28977190, args=0x0, from_tty=1)
at .././gdb/cli/cli-decode.c:62
#9 0x08082e6d in cmd_func (cmd=0x28977190, args=0x0, from_tty=1)
at .././gdb/cli/cli-decode.c:1666
#10 0x08054cbd in execute_command (p=0x2890c081 "", from_tty=1) at top.c:455
#11 0x080feadf in command_handler (command=0x2890c080 "c") at
event-top.c:519
#12 0x080ff307 in command_line_handler (rl=0x2895b112 "c") at
event-top.c:804
#13 0x28319826 in rl_callback_read_char () from /lib/libreadline.so.7
#14 0x080fe1cf in rl_callback_read_char_wrapper (client_data=0x0)
at event-top.c:179
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